 Photosynthesis, it was an absolute game changer back in the day. There are several reasons why it is seriously a phenomenal process. Number one, it made it so that critters were guaranteed to never run out of food. They could make their own. I also often thought, oh my gosh, I wish that I could have like chloroplasts, tattooed all over me, but real live ones, tattooed all over me. And then I could just sit in the sunshine and have lunch and not ever have to eat anything ever again. Like that would be so amazing. A grow light. I could just sit next to a light and I would have all the food I ever needed, ever. Oh, I shouldn't even think about it, especially right now. So if you knew that you had all the food that you needed ever, that's a very good thing. Second, photosynthesis is the process that resulted in our oxygenated atmosphere. If it wasn't for photosynthesis, there would be no oxygen in our atmosphere. And without oxygen, we would not exist. So that is game changing in and of itself. It also somehow, I don't know all the chemical details of this, but it facilitated the creation of the ozone layer. So the process of photosynthesis produced the ozone layer that protects us from ultraviolet radiation, which is also very handy. When photosynthesis began, there was just like this explosion of biodiversity. As critters, like it was like a jackpot. As critters went, dude, I can take advantage of this kind of environment. This oxygen that's available to me, now not only is that critter making its own food, but it's making its own food. I can eat it, and it's also like farting out a gas that lets me metabolize the sugar in that thing that I just ate. I mean, it's phenomenal. So photosynthesis, like go give a tree a hug or kiss a leaf or something because it's pretty amazing. We're going to end this lecture with a walkthrough of an animation that's very similar to the one that I did for cellular respiration, and we're going to call it good. Holy energy. That was fun, huh?